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A shaft running at 300 rpm is required to transmit 300 horse power. The working stress in shear is 420 kg/cm2. The diameter of the shaft whould be in the range

[A].	1 cm to 2 cm	[B].	2 cm to 3 cm
[C].	3 cm to 4 cm	[D].	4 cm to 5 cm
[E].	7 cm to 9.7 cm

Answer: Option E

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